Differentiate between the two cells enclosed in a mature male gametophyte of an angiosperm.[

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Nazia Khanum

In angiosperms, the male gametophyte, also known as pollen grain, consists of two cells enclosed within a tough outer layer called the pollen wall or exine. These two cells are the generative cell and the tube cell, and they play distinct roles in the process of fertilization. Generative Cell: The...
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In angiosperms, the male gametophyte, also known as pollen grain, consists of two cells enclosed within a tough outer layer called the pollen wall or exine. These two cells are the generative cell and the tube cell, and they play distinct roles in the process of fertilization. Generative Cell: The generative cell is typically larger and more centrally located within the pollen grain. Its primary function is to undergo mitosis to produce two sperm cells. These sperm cells are eventually involved in fertilization, where one fuses with the egg cell to form the zygote, and the other fuses with the polar nuclei to form the endosperm nucleus, leading to the development of the endosperm, a nutrient-rich tissue within the seed. Tube Cell: The tube cell is smaller and usually located towards the periphery of the pollen grain. Its main role is in pollen tube formation. After pollination, the pollen grain lands on the stigma of a compatible flower, where it germinates. The tube cell elongates and develops into a pollen tube, which grows down through the style of the pistil towards the ovule. The pollen tube serves as a conduit for the sperm cells to reach the female gametophyte (embryo sac) for fertilization. In summary, while both cells are enclosed within the pollen grain of angiosperms, the generative cell gives rise to the sperm cells responsible for fertilization, while the tube cell develops into the pollen tube, facilitating the transport of sperm cells to the female reproductive structures. read less
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